I am glad we are over the bickering and onto something educational.
This isn't BT.
I've read the POH twice now and I can't find anything super obvious.
Apart from disagreeing with a number of things written in there the only thing I can find coming remotely close to fitting in with the riddle is:
"best economy -
enrich 0_o mixture until the EGT indicator is 25-50deg F rich of peak EGT"